Gas Reserves (tables)

3 Months Ended

Mar. 31, 2015

Gas Reserves Table [Abstract]

Gas Reserves Table [Text Block]

	March 31,				December 31,
In thousands	2015		2014		2014
Gas reserves, current	$	19,112	$	21,990	$	20,020
Gas reserves, non-current	168,352		156,450		167,190
Less: Accumulated amortization	43,165		21,556		37,910
Total gas reserves(1)	144,299		156,884		149,300
Less: Deferred tax liabilities on gas reserves	28,383		30,704		18,551
Net investment in gas reserves(1)	$	115,916	$	126,180	$	130,749